Sudoku is a popular puzzle in which you must fill in the missing numbers in a grid, typically with 9x9 cells. Each row, each column, and each 3x3 box must contain all the digits from 1 to 9, with no duplication.

You have probably seen Sudoku puzzles in your local newspaper. If you enjoy Sudoku or would like to try it, then download this free program; it will help you with the puzzle in three main ways:

1. It will generate an unlimited number of puzzles for you to solve. (you can customize these in many ways)

2. It will assist you to solve puzzles yourself by keeping track of your entries and trials. (you can solve the puzzles it supplies, or type in the ones from the newspaper)

3. It will solve the puzzles for you if you wish. (note how much quicker it is to solve a puzzle by logic, instead of guessing!)